Manhole-cover



(No Model.)

T. P. GREGER. MANHOLE COVER.

2 Sheets-Sheet 1.-

Patented Apr. 2. 1895..

(No Model.) I 2 Sheets-Sheet 2. T. P. GREGER. MANHOLE UOVER.

N6. 536,621. Patented Apr. 2, 1895.

THE u'amzls PETERS c0, PHOTO-LITNO.. wAsnmmm. u c.

NITED STATES PATENT OFFICE.

THOMAS GREGER, OF PHILADELPHIA, PENNSYLVANIA.

MANHOLE-COVER.

SPECIFICATION forming part of Letters Patent No. 536,621, dated April 2,1895.

Application filed December 10, 1894. Serial No. 631,315. (N 0 model.)

To all whom it may concern.-

Be it known that I, THOMAS P. GREGER, a citizen of the United States,residing at the city of Philadelphia, in the county of Philadelphia andState of Pennsylvania, have invented certain new and useful Improvementsin Manhole-Covers, of which the following is a specification.

My invention has relation to covers for manholes such as are provided insewers, electric conduits, vaults and gas mains located in pavements orin streets or roadways; and it relates particularly to the constructionand arrangement of covers for such purposes.

The principal objects of my invention are, first, to provide a noiselessventilating cover for the manholes of sewers, conduits or otherunderground structures and with the provision of the same with simpleand effective means whereby the cover may be quickly removed from itsseat in the manhole of the structure; second, to a manhole cover havingan asphalt or similar material filling body so applied as that thematerial affected by heat and cold is not displaced, but maintained inrequired position and condition and so as to provide a noiseless coverin the passage of a heavy body or vehicle over the same, and, third, toprovide a manhole cover having ventilating apertures therein, and handlifting devices either fixed or movably connected therewith and the bodyfilled in with asphaltum or similar material caused to firmly cling tothe flanged and ribbed projecting surfaces of the cover in such manneras that sagging is obviated and contraction and expansion due toatmospheric changes duly compensated for and accommodated, whereby athoroughly reliable, noiseless and readily removable cover for manholesin general is insured.

My invention stated in general terms consists of a cover for a manholeconstructed and arranged in substantially the manner hereinthe same, andalso showing the ribbed top,

outer rim, the movable hand lifting devices connected therewith andmeans therein for permitting thereby of the ventilation of the manhole.Fig. 3, is a cross-sectional view on the line 00-50, of Fig. 1, showingthe normal position of one of the hand lifting devices of the cover.Fig. 4, is a top or plan view, in broken section, of the outer edge orrim of the cover showing a modified form of lugs or projections casttherewith. Fig. 5, is a top or planview of a modified form of the coverfrom that of Fig. 1, showing the filled in body of asphaltum or similarmaterial, the ventilating openings extending therethrough, the roughenedouter top rim and the fixed hand lifting devices thereof. Fig. 6, is avertical central section through the manhole and cover, showing thedetail construction and arrangement of the parts thereof, as illustratedin Fig. 5. Fig. 7, is a sectional view on the line yy, of Fig. 5, of oneof the stacover filled with asphaltum or other material and forming the.body thereof.

Referring to the drawings, A, represents the manhole of an undergroundstructure provided in the upper part with an internal projection a,having an outwardly inclined wall a, and the'two forming a seat A, forthe reception of the rim b of the cover B, as clearly illustrated inFigs. 2 and 6. The rim 6, of the cover is provided with an inclinedperipheral edge snugly fitting the seat A, of the manhole.

The cover B, is formed with an arched bottom b, having an integralspanning rib or ribs 1), as clearly shown in Figs. 2 and 6, forstrengthening the bottom of the cover B, and projecting vertically fromthe upper surface of the bottom are concentric ribs or rings 1) and 12having the upper edges or portions thereof flaring outwardly or flanged,as clearly illustrated in Fig. 2, fora purpose to be presently fullyexplained.

On the outer peripheral rim b, of the'cover,

as shown in Figs. 1 and 2, are staggered lugs or projections b arrangedat suitable distances apart around the surface of the same for producinga roughened surface about that portion of the cover.

On each side of the cover are provided dishshaped recesses orreceptacles b and b and engaging therein are movable hand lifting ringsor devices a and c, encircling the outer flanged rim of the cover. Theselifting devices are so arranged as that an implement may be insertedbeneath the surface of the ring or device for engaging the same and soas to permit of the removal of the cover B, from its seat A, in themanhole A.

b are a series of tapering openings extending through the cover B, atsuitable distances apart, for permitting of the ventilation of themanhole, for example, in the manner illustrated in Figs. 1 and 2.

Between the circular projections ofthe cover and the outer flanged rimis inserted asphaltum or other similar material, which is pressed in andcaused to solidly adhere to the cover to produce a noiseless one andwhich material is held to position against expansion and contraction, aswell as sagging, by means of said ribs, projections or concentric ringsand also from displacement by the niche or notch U, in the inner surfaceof the flanged rim of the cover B, as clearly illustrated in Fig. 2, andthe ribs, projections or rings concentrically arranged as shown in Fig.1, and formed integral with the cover, overlap onto or into theasphaltum or similar material 0, thereby firmly holding the same toposition against any downward or other pressure brought to bear upon thesame, and this material constituting the filling body of the cover,produces a noiseless cover for the manhole and one in which its presencein the manhole A, is scarcely perceptible, because the same so fits thehole as that the top is brought flush with the surface of the roadway orpavement.

In Fig. 4, is shown a slightly modified form of lugs or projections tothat shown in Fig. 1, around the peripheral rim of the cover B, in thetop surface thereof, forproducinga roughenedsurface about the same, inwhich may engage the hoofs of horses in crossingto prevent slipping; andmoreover, to provide a purchase in instances, where such is requisitefor manhole covers.

In Figs. 5 and 6, the construction of the manhole is substantially thesame as hereinbefore described, the only difference being in theconstruction of the cover, which in this instance is provided with aconcentric flanged projection 1) having a series of radiating arms I),therefrom connected with the peripheral rim 5, and between which isfilled in asphaltum or similar material C. The arms of the concentricprojection forming the inner walls of the cover and bearings for thefilling material C, are arranged so as to provide in conjunction withthe inner surface of the flanged rim portion of the cover, the means toprevent displacement of said filling material, when ithas become set inthe body of the cover 13, and affording the necessary means for guardingagainst and compensating for contraction and expansion of such material,due to atmospheric changes or conditions to which the same is subjectedby reason of its exposure to the same. Instead of providing the cover inthis instance with movable hand lifting devices a and a, as in Figs. 1and 2, the dish-shaped recesses b and 12 formed on both sides of thecover B, in the flanged rim b, thereof are provided with stationary handholes 61 and d, for engaging hooks or otherimplements therewith, forpermitting of the removal of the cover from its seat A, in the manholeA.

The manner of applying and removing the manhole covers, will be readilyunderstood from the drawings, without more detail description of thesame.

Having thus described the nature and'objects of my inventiomwhat I claimas new, and desireto secure by Letters Patent, is-

The combination with a man-hole provided with a seat, of a cover filledwith asphaltum or similar material having an arched bottom provided withsuitable strengthening ribs on the undersurfaee and with a rim andflanged ribs on the uppersurface thereof, said rim being notched andprovided with an inner retaining flange, said material being held insaid cover by said flanged rim and ribs, ventil-ating openings extendingthrough said rim, and hand lifting devices connected with said rim andin normal position located below the plane of the same, substantially asand for the purposes described.

In testimony whereof I have hereunto set my signature in the presence oftwo subscribing witnesses.

THOMAS P. GREGER.

lVitnesses:

THOMAS M. SMITH, RICHARD C. MAXWELL.

